CVE-2023-35311 Microsoft Outlook: login or permission bypass
In plain words: A door that should be locked is not: part of the system can be reached without a valid login or permission. The attacker gets in as a user or administrator without knowing a password.
Confirmed exploited by CISA on · US federal patch deadline Aug 1, 2023
What to do
- Install Microsoft's security update for Outlook. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic updates for the operating system and for Office, PDF and archive apps.
- Be careful with unexpected attachments — documents, .zip/.rar files and shortcuts are common bait.
- Use a normal (non-admin) account day to day and keep built-in protection like Microsoft Defender on.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Your files, saved passwords and accounts. Many of these let a program that is already running gain full administrator control.
The details
- Official name
- Microsoft Outlook Security Feature Bypass Vulnerability
- Product
- Microsoft Outlook
- CISA description
- Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.
- Type of flaw
- Login or permission bypass (CWE-367)
- Confirmed exploited
- Jul 11, 2023
- US federal patch deadline
- Aug 1, 2023
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Answering about CVE-2023-35311 ·
Questions about CVE-2023-35311
Is CVE-2023-35311 being exploited?
Yes. CISA added CVE-2023-35311 to its Known Exploited Vulnerabilities catalog on Jul 11, 2023, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2023-35311?
Install Microsoft's security update for Outlook. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic updates for the operating system and for Office, PDF and archive apps.
Am I affected by CVE-2023-35311?
Only if you use Microsoft Outlook. This one is aimed at devices or apps of the kind people own.